Why Gravity is NOT a Force

36 485
The General Theory of Relativity tells us gravity is not a force, gravitational fields don't exist. Objects tend to move on straight paths through curved spacetime. Thanks to Caséta by Lutron for sponsoring this video. Find out more at: www.lutron.com/veritasium
Huge thanks to Prof. Geraint Lewis for hours of consulting on this video so I could get these ideas straight in my own brain. Check out his NOburn channel: ve42.co/gfl or his books: ve42.co/GFLbooks
Amazing VFX, compositing, and editing by Jonny Hyman
2D animations by Ivàn Tello
Filmed by Steven Warren and Raquel Nuno
Special thanks to Petr Lebedev for reviews and script consultation
Music by Jonny Hyman and from Epidemic Sound epidemicsound.com
Rocket made by Goodnight and Co.
Screen images in rocket by Geoff Barrett
Slow motion rocket exhaust footage from Joe Barnard at BPS.Space
Runtime: 17:33


Veritasium - 11 dager siden
Here's a question I've seen a lot in comments: OK, I'm accelerating up but then shouldn't someone on the other side of the globe fall off? No, here's why:
Either watch again from 8:28 or read what I've written below...
Spacetime is curved - it curves the opposite direction on the other side of the Earth. 
Neither us on this side of the Earth nor they on the other side are changing our spacial coordinates - we're not moving up, they're not moving down - Earth isn't flying into one of us.
BUT we both ARE accelerating. In curved spacetime you have to accelerate just to remain stationary.
The traditional definition of acceleration is something changing its velocity.
In general relativity you have to embrace a new definition of acceleration: it means deviating from a geodesic - not going on a straight line path through spacetime. Near the Earth a geodesic is a parabola so unless you're moving in a parabolic arc (like on a zero-g plane) you are accelerating.
This definition is the same as the old one  so if you're accelerating in deep space then your velocity is changing.
*BUT*... if you are near a large mass you are in curved spacetime, now acceleration  your velocity is changing. You can stay stationary relative to Earth's surface and still be accelerating. This is because your acceleration should be measured not relative to the Earth's surface but relative to free-falling objects - they are inertial observers.
Imagine this - I'm in deep space and I make horizontal rows and rows of stationary golf balls. Then I hop in my rocket and accelerate up through them. Just think about what that looks like. Now my rocket is back on Earth just sitting there. I freeze time for a sec and make horizontal rows and rows of golf balls up into the atmosphere. Now unfreeze time. What do you see? If you just look at the golf balls and the rocket ship it looks the same as the situation in space where the golf balls were stationary and the rocket was accelerating. Einstein's point was the golf balls have the better claim as the "stationary" thing since their experience is just like the golf balls in deep space - no forces experienced. The rocket on Earth is just like the rocket in space. It feels a force and hence an acceleration.
adorable - 3 dager siden
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Tanaphar Plus Masks
Tanaphar Plus Masks - 29 sekunder siden
What do you mean gravitational fields don't exist? Fields are just things we project into space so that we can make a 'picture' of the various force-strengths 'hovering' around the object. Fields are just 'the whole series of forces' pictured at once. Fields are a human creation. Nothing about nature. It was never true that force fields 'exist'. Right? No? Except as 'human conceptual tools' to aid in navigating the object's behavior etc therein. What am I missing? As far as I always understood, there is no force 'there' and no collection of forces 'there' -- force field.
This is just a human tool. Kind of like grid cast over space so that we talk about distances between things in terms of squares. We might call that a 'extent field'. Of course, it's not something actually there. It does not actually exist. So what am I missing here? Because apparently this is an important and somewhat new realization --- that gravitational force fields don't exist. But it was always like that. Even when talking about other force fields. They don't exist. In fact, some physicists (including Einstein) believed/believe that all those things are really somehow the same thing as gravity. Just we don't see how.
Perhaps you meant something special by "it doesn't really exist". Perhaps you meant.... "We call it a force when an object is 'acted on' and the laws of physics ARE NOT the same to it compared to an object not acted on. And for gravity, they ARE the same, so therefore, it's NOT a force". OK, that's fine, because now we have a difference between circumstances and you are just saying "we call it force when it's like that" and "we don't call it force when its like this". No problem. But then this video just seems to be an elaborate clarification about how physics defines things, rather than some discovery about nature.
Am I wrong? How so? Also what is the simplest example of a force that DOES exist? And what does it contain exactly which 'reveals' it as a force?
Ionut Mihai
Ionut Mihai - 5 minutter siden
if gravity is not a force, why peoples from other part of the earth don't fell off?
David Lazarus
David Lazarus - 17 minutter siden
Um . . . According to Brian Koberlein, a respected scientist with whom I do not always agree, gravity is not JUST a force as relates to general relativity. On that particular notion within the article linked below, I agree.
Q - 19 minutter siden
Gravity IS a force. Stop making people stupid with your nonsense.
LocoBizz - 21 minutt siden
Saying gravity is not a force is fine, but saying that gravity itself is an illusion is incorrect. Gravity is the curvature of spacetime, by definition if gravity is an illusion then so is the curvature of spacetime.
Ojas Kubal
Ojas Kubal - 38 minutter siden
i'm just gonna go do a backflip now cuz i know gravity won't be able to screw me over now
Commando303X - 44 minutter siden
So, Phoebe Buffay was right, after all...
nofreewill - 47 minutter siden
But don't we feel only things that makes our "sensors" deform? We don't feel if we were in a field of force because there is equal force acting on all of our particles. There needs to be a gradient to make our sensors stretch.
Krichna Drofdel
Krichna Drofdel - 50 minutter siden
Sooooo...... We're not moving? 😵
hakan kaan
hakan kaan - Time siden
then how the planet has been occured ? and if its true i wondered what happen when you are create aan emptyspace in the earth center ?
Nick Overstreet
Nick Overstreet - Time siden
You look a bit like Elon Musk
Scaff 1989
Scaff 1989 - Time siden
yeah cause the earth is flat and gravity isnt real
Etienne dk
Etienne dk - 2 timer siden
If gravity is a result of acceleration pushing us into the floor, then why do people on the other side of the planet not feel lighter?
Przemek Kardyś
Przemek Kardyś - 2 timer siden
The reason why accelerometer shows nothing is that centrifugal force from velocity, and centripetal force from gravity equals and reduces in every single quantum of matter in this spaceship.
It's not the military centrifuge, that keeps in place only tightly secured pieces, and the rest wanna fly away. It can grab every single atom of human body and the ship, so it moves the same way, so there's no feel of any force.
/OVERDRIVE\ - 2 timer siden
as much as i want to understand this i just dont
RBEmpathy - 2 timer siden
This is big globe propoganda! Embrace the Lord! Repent! They're just coming up with even more complex ways of selling a lie to you. Wake up!

Lol jk - awesome video!
GreenRay - 3 timer siden
the earth is curved too though. so they don't fly straight. if you stay the same height moving along the earth's surface you still go around it. if you stopped curving, you'd eventually leave the earth's atmosphere, or crash onto the surface.
StankyBaboon - 3 timer siden
I’m still confused on why the earth isn’t expanding since gravity isn’t a force.
Van Dalit
Van Dalit - 3 timer siden
I doubt make a question here have sense, but idk.
i´m watching something of neil degresse tyson and hawking right now, and a wonderfull subject show up;
The stars "collapse" on their own gravity, if gravity is not a force, what or why the stars collapse?
Eduard Greta
Eduard Greta - 3 timer siden
Bunch of bs.
Mike Bou
Mike Bou - 4 timer siden
Congratulations, you just proved that Time Travel is a mental disorder.
murcielago Batman
murcielago Batman - 4 timer siden
I don't get it then what weight?
Jesse Whitchurch
Jesse Whitchurch - 4 timer siden
Probably the most intriguing video I've ever seen. Crazy
Tom Mannix
Tom Mannix - 4 timer siden
This channel does my head in. Love it! But man...
Daddy Earth
Daddy Earth - 4 timer siden
Stop winding-up flat-earthers.
YoutubeR - 5 timer siden
does the empty space in the atom increase with the expansion of the universe ie:- are they more tightly packed so smaller in the early universe
and would that change its property's like density
Wot would we notice if we got twice as big at the atomic level if spacetime length has doubled due to expansion ????????
Gordon Burford
Gordon Burford - 5 timer siden
2:05 - you could look down.
lingerslongest - 5 timer siden
This video curved my brain. I also enjoyed the explanation with the cosmic squirrel done by The Science Asylum
: "The REAL source of Gravity might SURPRISE you"
Aleksander Medella
Aleksander Medella - 5 timer siden
Only me is bothered by his tiptoes coming out of the spaceship?
Codademy - 5 timer siden
Who is this guy? 😂
David Stevens
David Stevens - 5 timer siden
If satellites and spacecraft in Earth orbit are just following a straight line path through spacetime that is curved by the Earth’s mass, why doesn’t a beam of light also follow the same path and orbit the Earth?
Storm At Home
Storm At Home - 5 timer siden
So, Iam hanging massive steel ball on tape. And the tape is stretching... No field, obviously :)
salg13 - 5 timer siden
I just watched this and enjoyed it quite a bit. I've always considered there to be two models for gravity. Relativity; which has curved spacetime and is described here, and the Quantum Theory; in which gravitons are predicted. These two models work differently and will someday, hopefully, be reconciled. This is similar to Relativity and the Theory of Gravity; they both work, but need to be consolidated.
Burkhardt Family
Burkhardt Family - 5 timer siden
im really confused, if the Earth is accelerating in to us, how do the people at the "bottom" of the Earth not fly off. Physicists of Youtube help me!!!!
Tom Finochio
Tom Finochio - 6 timer siden
Tell me that again, after you drop a 100 lbs on your foot!
Brent Birsa
Brent Birsa - 6 timer siden
You brought freshness to an old repeated topic and I think that showing multiple equations in a logical sense helps people evolve their thinking. I would really like a part 2 describing the Wheeler quote.

6:00 I really liked how explicit you were showing the curved space time around the Earth and even showed standard trampoline/well 3D demo is better planar. IMO: Square space should not be taught except for a way to make measurements easier because sometimes the 1st thing learned sticks and it takes so much time trying to convert perceptions.

6:52 You quoted John Wheeler, but to me, this is the crux of gravity and I NEVER HEAR HOW THE 'TELLING' WORKS and assume Least Action, which is voodoo fundamental! Will there be a next video explaining how space knows how to change with energy/matter? How is this messaging done without a force? It sure does spread like other forces. Why isnt the information transfer between energy/matter and space time called Gravity force?

7:36 & 9:12 I don't understand "Equal and Opposite forces cancel so no net force". I wish you had the stick figure do a squat and asked why he would tire quickly (f=ma) if he is at rest and not accelerating (any reference). Try a plank for minutes @ 1g and tell me you can't feel your back NOT KEEPING UP.

I like that you brought up that Electromagnetism/Light is used by matter (Planet, human and rockets) but it would have been nice to explicitly hear how and how much of that force is being used.

I wish you would have mentioned accelerometers (common in phones and watches) continuously read 1g away from the Earth when placed on a table, which allows it to orient similar to a magnetic compass. I think it is amazing how far a satellite could travel at constant 1g acceleration and it makes me feel better about my short plank times.

If I let go of an object while moving on my bike it wont continue with me and I can feel doing 'effort' while holding myself and anything I am carrying until I let it go and it does not stay with me. We have to think about sideways vs Earth inertia/space shape in everything we do so why do we need a rocket/elevator vs Earth acceleration examples or saying Gravity would need to weigh objects so that it can give correct force to drop at the correct speed. Playing sports takes an amazing amount of judgement that becomes somewhat innate in determining how inertia will affect a ball horizontally and vertically. Before I knew of relativity, I found much in classical mechanics annoying (energy is a worse topic and later discover some are called fictitious) so why do we teach and act like it is innate to be inversed? Sometimes physics discussions seem too defensive for old information from the 1600s and not explained by 'depends which reference that you pick'.
Robert Mecalis
Robert Mecalis - 6 timer siden
WTF Balderdash.
Filipe N
Filipe N - 6 timer siden
The two people walking in the geodesics would never come together if they stopped walking.
Although impossible, since everything in the universe is moving, if earth stopped moving would there be no gravity?
If the universe stoped expending gravity would no longer exists?
Etimespace - 6 timer siden
The so-called gravitational pushing forces. The pulling forces and curving space are a hiss.
It is good to understand this first. The substance consists of expanding densities that recycle the expanding pushing force. All the expanding nuclei of atoms recycle the expanding dark pushing force which has e.g. the nature of expanding electrons and expanding photons.
1. The surface of the expanding Earth pushes us away from the center of the expanding Earth.
2. A pushing force through our body so that it originates from every expanding atomic nucleus of the Earth and thus pushes each expanding quark of our expanding body in separate expanding densities away from the center of the expanding Earth.
3. The expanding pushing force from the zillion-expanding quarks of billions of galaxies that collides with every expanding quark in our body and pushes them in separate expanding densities wherever it was going. And this pushing force is thus also pushing through the expanding Earth, experiencing a change in its density due to the interaction with the expanding matter of the Earth.
4. An expanding pushing force that originates from an expanding Earth and protrudes away from the Earth by interacting with an expanding pushing force pushing toward an expanding Earth. Here, it is good to note that, for example, the mass, state, and density of each expanding planet are different, so the expanding thrust from them affects the expanding planet differently with the expanding thrust.
5. The expanding planet thus interacts with the self-penetrating expanding thrust densities, and thus the mass, volume, and density of the planet are defining how much these planetary expanding densities exert a thrust on each separate expanding quark of our expanding body as separate objects. And that is, therefore, related to the accelerating movements in which our bodies are involved so that we cannot sense them with the help of our bodies. Probably too much for you.
Accelerating movements we did not sense with the help of our expanding body.
1. Accelerating motion away from the expanding Sun.
2. Away from the center of our expanding galaxy.
3. Away from other expanding galaxies.
4. Away from an object that is really really far beyond the visible universe expanding in space.
NichiRo Сhannel Озвучка Японских Роликов
*If gravity ain't force, gravity wave also not force??? In the same way of thinking, for example pressure is not force and many many other phenomens relevant to "force" ain't force?*
Anibal Santiago
Anibal Santiago - 6 timer siden
Here's an idea show scientific evidence for gravity by way of the scientific method. Next explain Newton's Apple falling from a tree only using Einstein's equation. Do not reduce them down. You won't be able to do that either they don't solve for more than one Mass. So it's an absolute fact that there is no scientific evidence for gravity. Can't wait to see the backlash I get for this comment
John Coppock
John Coppock - 6 timer siden
Beautiful, beautiful videography. Not sure if you did this all by yourself. If so, you are a one-man production studio. Regardless of this it is probably the most polished YouTube video I have ever seen.
OldManLink - 6 timer siden
I just have one question (I am still only half way through, but I have to ask before I forget) - what's with the giant alcohol molecule floating beside you in the spaceship? Are you saying we need to be drunk to understand this?
L B - 6 timer siden
Both charges will NOT radiate: The free-falling and the one at rest with respect to earth will NOT radiate. The Abraham–Lorentz force which is related to the radiation produced by accelerating charges depends on the derivative of the acceleration (Also called jerk). Both have constant acceleration and therefore will not radiate
Random Garbage
Random Garbage - 7 timer siden
this is an amazing video. explained gravity extremely well
iamlsusam - 7 timer siden
When he hits the ground...
gelatinous cube
gelatinous cube - 7 timer siden
Soo.... Flat Earth?
Truth Prevails
Truth Prevails - 7 timer siden
@Veritasium Here's one for you....BTW I love your videos....I like you dude, I am trying to help you....... think about this...... Okay, I am sure you have a powerful zoom camera.......take that camera and consider it's zoom capabilities......... Try to zoom further than it's specified capabilities and see what kind of clarity you get in your images........ You can verify yourself, how far away you can actually see....Then take that same camera, zoom in on the moon........ Is it possible to get that clarity from 238,000 miles away? I think not..... You know not...... When you realize the moon is smaller and more local as transverses within our atmosphere, you will view the entire meaning of your existence within this world where EVERYTHING and EVERYONE in intertwined and synergistically harmonious. None of this is even fathomable if everyone believes a fairy tale of space and light years apart formed by an explosion of nothing into something..... There IS a CREATOR which IS that energy that connects us all........ I would love to see you explore this little test to determine if it is possible to zoom in on an object 238,000 away using a camera with only 83xs zoom capabilities..... Heck, phone cameras are capable of moon zoom. Is that possible my friend? It's not..... SO I don't expect a video on it anytime in the near future.....
Scott Leaf
Scott Leaf - 7 timer siden
Way to take it up a notch with your production values
Томат Огородов
Томат Огородов - 7 timer siden
Why replace curved line with curved space?
Truth Prevails
Truth Prevails - 7 timer siden
The cosmology you refer to uses 100% assumptions. The distances or the composition of objects allegedly in space, millions of miles away, cannot be determined....Only assumed.....
Curtis Hooper
Curtis Hooper - 7 timer siden
Also: https://youtu.be/EmrZ3ZaXmS4
Truth Prevails
Truth Prevails - 7 timer siden
If the FACE of the earth has it's center, which it does........then the same thing would happen as you move from the outer parts towards the inner parts. Just as a piece of pie comes to a point at the center of the pie, the same thing happens on the FACE of the earth. I am surprised that you even used this analogy to try to convince people the earth is a globe just because the lines meet in the center. I know you, after making this video, have even considered yourself, what if the earth really IS NOT a globe and is 100% level? WHat if that is true? How would I know? Well, they claim a radius of roughly 4000 miles (kinda small-don't ya think). Using this radius, there should be a GEOMETRICAL horizon at no more than 1.25 miles multiplied by the height of the observer, in feet, away from you...Therefore, if you EVER see the earth beyond this point, it is obviously NOT, EVER cirving away from you..... WIthout the radius and without a curving earth, the spherical earth CANNOT exist... This my friend, will change your entire reality............
Jeremy Owens
Jeremy Owens - 8 timer siden
Now I'm just even more confused.
edge films
edge films - 8 timer siden
FORCE/FRICTION causes the gravity to exist, thats the pulling factor!
David Jackson
David Jackson - 8 timer siden
Okay, fantastic video, but how would this relate to gravity waves?
Laurent H
Laurent H - 8 timer siden
Of course gravity is a force, and a gravitational fields exist, hence we have "potential energy", that can be converted to kinetic energy and vice versa, for example in a pendulum. I mean, you was on school ? Teacher tells that. The rest is BS, we are not here to believe in "space time" instead of god.
Idan Sagiv
Idan Sagiv - 8 timer siden
Derek, I wondered, where I can get information about the source from which you took the equation 10:13, including recommendations sources to study the subject in depth
Glade le joueur
Glade le joueur - 8 timer siden
lol at first I was confused now I just feel dumb
Jeremy Owens
Jeremy Owens - 8 timer siden
Same brother. Physics have always hurt my head and I think having a solid understanding of the fundamentals would help a lot.
Game Account
Game Account - 9 timer siden
Does passing through an event horizon of a small black hole do anything to the explanation?
Aram Arakelyan
Aram Arakelyan - 9 timer siden
There is a very interesting and visual experiment that allows you to distinguish gravity from an accelerating rocket. If we hang two long pendulums, we will "notice" in the gravitational field that the pendulums are not exactly parallel to each other, although in a rocket they will lie on parallel lines. I don't know much about the theory of relativity, and I think I might be missing something. I will be very happy if someone answers
I leave this question in many places to increase the probability of getting an answer
Rujjivit tapashcharya
Rujjivit tapashcharya - 9 timer siden
I didn't understand the curvature term in equation can someone explain?
Abhishek Shrestha
Abhishek Shrestha - 9 timer siden
i didnt get much... but it was fun to watch
Aditya Iyer
Aditya Iyer - 9 timer siden
only mass large enough is the sun. someone forgot about the proof of existence of blackholes which was the very idea that light bends around blackholes. no proof or experiment needed.
David Jackson
David Jackson - 9 timer siden
Fantastic! BTW I just posted a link in the Facebook page "Space Hipsters" that has over 19K members throughout the science community. Be prepared for a surge in subscribers!
Sree Hari prasad
Sree Hari prasad - 9 timer siden
It turns out
Phoebe was right all this time.
Exauce Mayunga
Exauce Mayunga - 10 timer siden
Time doesn't exist, so space-time isn't a real thing. Gravity is a real force . Nice video tho.
a typical ml noob
a typical ml noob - 10 timer siden
so ur telling me gravity is an illusion and that we all just move on a curved space time.
Scott Rollins ,jr
Scott Rollins ,jr - 10 timer siden
Starfleet Command Skool Academy
Psychological Sciences Division
General Analyst Consult:

gravity as you call it
is more likely to happen in gases// usually surrounding a ball

why is gravity curved around
the gas divides the 'Density Gravity Polarity' named Universe

we fall be we are heavier then the gases but not more then the ground
as we fall the pressure next to us is on the vertical of another latitude of the earth (not the slip stream you've fall in)
// if we fell towards the center of the Earth we would either:
slow til float or fall & be crushed bc decompression happens above

micro_gravity & zero mass proves its links
//we float in the pressure of the universe not in a vacuum
Scott Rollins ,jr
Scott Rollins ,jr - 10 timer siden
GenAna Bison inquiry wtf forces moving up? WHAT ARE YOU? the earth is spinning while revolving around the sun the general understanding of UP & DOWN are illusions the Weight of us (at this altitude) is not being countered by anything but the muscles in our body it is not acting like the blood in the body: using the pressure points & pulse points as inhibitors allowing the smooth transition of going back up ps the our core samples prove the earth expands (yes its from dead trees) allowing excess weight to push down: make mountains & volcanos
Typical Gamer Weeb
Typical Gamer Weeb - 10 timer siden
I will come back in 7 years and try my best to understand the video completely, its still very easy to understand for the most part but the way you deliver this theory makes it so interesting that it makes me feel more motivated in learing more about the universe, the forces and everything. i want to more
Heisenberg - 10 timer siden
I think it would be better simplified if you just said that the earth is moving through space at a velocity, and the weight we feel is the acceleration when we stand "stationary" on earth, and the person who is free-falling is the inertial observer because that acceleration no longer acts on them so they see the person through the window standing there accelerating upwards by the earths velocity. Similar to standing in the rocket as the rocket blasts off
Built To Rule
Built To Rule - 11 timer siden
Conclusion: The Earth Is Flat
Alain M.
Alain M. - 11 timer siden
This video explains it so well. A very insteresting question remains: how does spacetime behaves inside a black hole?
Redrooster - 12 timer siden
The ground isn't holding us up? It's our muscles and bones against the 15 psi of atmospheric gases. That is what gravity is on Earth!
Frankie Dog Turner
Frankie Dog Turner - 12 timer siden
What a total load of absolute twaddle. B/S pf the highest order. Insane idiocy.
Frankie Dog Turner
Frankie Dog Turner - 4 timer siden
@Jeremy Owens Ok here we go. Einstein was a fraud even if sometimes it seems that he actually believed his particular line of fraudulent B/S. It doesn't t really matter. He was a fraud non the less. He had no idea. Take this example "if you are falling you are weightless" - just not true. It is like saying if you are in a hot air balloon being blown along by the wind at 60 km an hour there is no wind because you can feel it in your face. Or maybe the aircraft you are travelling in is not really travelling at 600 miles an hour while you are inside it because you can walk up to isle at two miles and hour from one end of the plane to the other. Or maybe the world is not turning because we can't feel the motion. Einstein was a fraud a fool or a con man - maybe he was all three. This guy Veritasium has never had an original thought in his life and is truly idiotic when he tries to 'explain' idiocy like this.
Jeremy Owens
Jeremy Owens - 8 timer siden
Ah yes, what a constructive comment detailing the flaws and misinformation plastered throughout this video. Excellent observation friend, glad we have experts such as your self.
Hassan Rabbi
Hassan Rabbi - 12 timer siden
huh, I knew Newton was lying
Daane Mest
Daane Mest - 12 timer siden
This thread lacks flerfers.... came here to read flerfer bollocks. :D good vid though.
Semen Semen
Semen Semen - 12 timer siden
You have got a brother (twin) ?
Adam Siman-Tov
Adam Siman-Tov - 13 timer siden
Mind-blowing ! thanks for that awesome video !
ono app
ono app - 14 timer siden
Ha correct correct gravity is not force, just for fun earth is flying in space without any support, sun, earth milkyway everything just flying just for fun
Elitebatzen - 14 timer siden
I dont understand the part were you eccelerate without changing your coordinates.
Robert - 14 timer siden
Why is it that a more dense object is harder to lift than a less dense object of the same size??? Is it because the object with more mass has more momentum???
Roy Javier
Roy Javier - 14 timer siden
so what is this if gravity is not a force?
The Four Fundamental Forces of Nature
The weak force.
The strong force.
Charith Patnaik
Charith Patnaik - 14 timer siden
But what about Black Hole if the Gravity is not force why is tte light is not able to escape it. Till now I thought light is effected by the gravitational force.
下工尺モS卄丹刀口山 - 14 timer siden
wow! I actually get it!
Emmanuel Koech
Emmanuel Koech - 15 timer siden
Can this be used to explain that the earth is flat, and that its just the spacetime that is curved?
Jeremy Owens
Jeremy Owens - 8 timer siden
No. Don't be stupid.
devansh sharma
devansh sharma - 15 timer siden
What is gravitational force than?
Chandan Bhowal
Chandan Bhowal - 15 timer siden
It's a shame I don't understand it. I have been trying to understand it since I was 15(23 now). I mean, I get the sentences and examples, but I still don't understand it. I think I would truly understand it if I knew the mathematics of it.
Jeremy Owens
Jeremy Owens - 7 timer siden
Yep. You'd have a much easier time understanding it if you had some of the fundamentals of physics down. I'm 27 now and I've been out of school for so long (finally decided what to go to university for,) that I actually started back in grade 10 physics and worked back up to a college level. It helped a lot but I've still got a lot to learn. It's pretty crazy how fast you can forget things you don't use/do everyday.
Fact & Figures
Fact & Figures - 15 timer siden
Nick Fuller
Nick Fuller - 15 timer siden
If gravity is just acceleration thru space, then why do things accelerate as they fall. Shouldn’t everything fall at terminal velocity instantly, no matter the distance
rhysenna - 15 timer siden
Dam it. I almost understood what he was saying. 😅
Van Nguyen
Van Nguyen - 15 timer siden
So we're not actually being sucked. The earth just happen to accelerate to us. Is this because the earth constantly moving around the sun and also constantly spinning on its axis?
So in this case can I say that the earth is applying a upward force to my body? And based on the theory that I forgot the name. When you apply a force on an object, you will receive a force of the same amount. Something like that. So in this case, our body applies the same force to the earth but downward. So is this downward force the gravitational force everyone is talking about?
Caleb - 16 timer siden
great vid! now can you do a vid on how to warp spacetime? why does "mass" do this?
Eternal Goof
Eternal Goof - 16 timer siden
So ... fictitious forces can end someones life. If this is true, life must be fictitious - or our understanding of gravity must be flawed. Pick your poison, physicist.
Christian Moranne
Christian Moranne - 16 timer siden
How to explain such a complex topic in such a simple way? You have all my respect Derek. Congrats! (And thank you)
Thunder 221
Thunder 221 - 16 timer siden
White kinda sus
krvnjrcbs - 17 timer siden
If there is no gravity, then I’m not overweight.

I’m just accelerating faster than you bro.
Take that Usain Bolt
Funky Drummer
Funky Drummer - 17 timer siden
I feel sad watching this right now knowing it's gonna have to end eventually, and that I can't watch this for the first time ever again
Michael Offutt
Michael Offutt - 17 timer siden